Since ancient times, the general principle for heirs is that the eldest son inherits the throne, but let's take a look at how many people really inherited the throne in ancient times. Very few. But since ancient times, the principle of the eldest son inheritance system is still in practice, but Saddam Hussein is different. He didn't choose his eldest son Uday.
Saddam Hussein has had many women and four justified wives in his life, but he only has two sons, the first named Uday and the second named Qusai. Saddam Hussein has been training Uday's successors from the beginning, but Uday failed to live up to expectations. He did something that made Saddam very dissatisfied.
Uday killed Saddam's bodyguard because he wanted to find a woman for Saddam. He killed Saddam's bodyguard in a rage. Moreover, Uday's personality is very violent and his hobbies are very special. He likes beautiful women, wine and luxury cars, and he is notorious in Iraq. Uday has many women, but he has no descendants, so his heir is also a problem.
But Saddam Hussein's other son, Qusay, is different. He has a good reputation in Iraq, is honest, and has a son who is completely opposite to Uday, so Qusai is more optimistic about him than Uday.